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{{Element | name=Lutetium | symbol=Lu | anumber=71 | amass=174.967 amu | state=Solid | class=Rare Earth | cstructure=Hexagonal| density=9.840 g/cm^3 | color=silvery white | stableisotopes=2 | date=1907 | discname=Georges Urbain, Carl Auer von Welsbach and Charles James | origname=From ''Lutetia'', the ancient name of Paris. | uses=Used in alloys and can be used as a catalyst in cracking, hydrogenation, polymerization and alkylation. It's primary use is in chemical research. | obtained=Found with [[ytterbium]] in [[gadolinite]] and [[xenotime]]. Its chief ores are [[monazite]] and [[bastnasite]]. }}
{{Element | name=Lutetium | symbol=Lu | anumber=71 | amass=174.967 amu | state=Solid | class=Rare Earth | cstructure=Hexagonal| density=9.840 g/cm^3 | color=silvery white | stableisotopes=2 | date=1907 | discname=Georges Urbain, Carl Auer von Welsbach and Charles James | origname=From ''Lutetia'', the ancient name of Paris. | uses=Used in alloys and can be used as a catalyst in cracking, hydrogenation, polymerization and alkylation. It's primary use is in chemical research. | obtained=Found with [[ytterbium]] in [[gadolinite]] and [[xenotime]]. Its chief ores are [[monazite]] and [[bastnasite]]. }}
'''Lutetium''' is the hardest and densest of the rare earth [[metal]]s. It has two stable isotopes (actually one, but another one has a [[half-life]] of over 10<sup>10</sup> years).
'''Lutetium''' is the hardest and densest of the [[rare earth metals]]. It has two stable isotopes (actually one, but another one has a [[half-life]] of over 10<sup>10</sup> years).
Lutetium was discovered in 1907 by Georges Urbain and others, after being separated from ytterbium. This brought to a close a long period of confusion about whether the (very similar) elements ytterbium, terbium, and erbium were different, and which one was which.
Lutetium was discovered in 1907 by Georges Urbain and others, after being separated from ytterbium. This brought to a close a long period of confusion about whether the (very similar) elements ytterbium, terbium, and erbium were different, and which one was which.